Question

2 balls are in motion and collide with the velocities and angles
shown. The top (red) ball has a mass of 3 kg, while the bottom
(blue) ball has a mass of 5 kg. The initial velocity of the red
ball is 15 m/s at an angle of 45o while the initial velocity of the
blue ball is ??? m/s at an angle of 40o. If the final velocity of
the top (red) ball is 12 m/s at 60o, and the final angle of the
blue ball is 30o, find the initial and final velocity of the blue
ball.
3 kg15 m/s, angle 45o
12m/s, angle = 60o